• S Arunachalam

      Articles written in Proceedings – Animal Sciences

    • Weight changes and survival of a tropical earthwormPontoscolex corethrurus

      S Arunachalam G Krishnamoorthy P Baskaran

      More Details Abstract Fulltext PDF

      The ability of healthy individuals ofPontoscolex corethrurus to survive and maintain its weight in tap water and different concentrations of NaCl and sucrose solution is studied. In water, earthworms survived normally but died at 48 hr exposure in 5% sugar and 0.4% NaCl. In water, an increase of 26% in total body weight was observed at 4 hr exposure. Weight also increased when exposed to 1, 2, 3 and 4% sugar solution, but it decreased in 5% sugar solution. This decrease in weight may be due to osmotic crisis. Similar weight changes have also been observed in NaCl solutions. An increase in weight was observed up to 0.3% NaCl and a decrease in weight in 0.4% NaCl and above.

    • Effect of carbaryl on esterases in the air-breathing fishChanna punctatus (Bloch)

      S Arunachalam S Palanichamy M P Balasubramanian

      More Details Abstract Fulltext PDF

      Electrophoretic analyses of liver and muscle ofChanna punctatus revealed that they contain atleast six and eight fractions of esterase, respectively. Characterization of esterase was made on the basis of their responses towards certain inhibitors. Liver esterase consists of acetylesterase and carboxyl esterases, whereas the muscle esterase has three types namely acetylesterase, carboxylesterase and cholinesterase. The liver and muscle ofC. Punctatus subjected to maximum sublethal concentration of carbaryl were electrophoretically analysed and it was found that both liver and muscle showed only three fractions of esterase.

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